#!/bin/bash#################### Check Active Host##########################function CheckInput(){if [ $# -ne 1 ] ; then  return 1else  return 0fi}function CheckIp(){/bin/ipcalc -s -c $1 &>/dev/nullreturn $?}function PingIp(){ping -c 2 -W 2 $1 &>/dev/nullif [ $? -eq 0 ] ; then  echo $1 >> $TMP_ACTIVEelse  echo $1 >> $TMP_DOWNfi}function PingAll(){PrefixIP=$(echo $1|awk -F '.' '{print $1"."$2"."$3"."}')for ip in {
   1..254}do  IP="${PrefixIP}${ip}"  PingIp $IP &done}function SelectPing(){ENDIP=$(echo $1|awk -F '.' '{print $NF}')if [ $ENDIP -eq 0 -o $ENDIP -eq 255 ] ; then  PingAll $*else  PingIp $*fi}function SortIp(){while :doPING_NUM=$(ps -ef|grep ping|grep -v 'grep'|wc -l)if [ $PING_NUM -eq 0 ] ; then`cat $TMP_ACTIVE|sort -t '.' -k 4 -n > /tmp/active.host``cat $TMP_DOWN|sort -t '.' -k 4 -n > /tmp/down.host`rm -f $TMP_ACTIVErm -f $TMP_DOWNbreakfidone}function Show(){ACTIVEIP=$(cat /tmp/active.host)DOWNIP=$(cat /tmp/down.host)if [ -s "/tmp/active.host" ] ; then  echo "Active Host:"  echo $ACTIVEIP|tr " " "\n"else  echo "Down Host:"  echo $DOWNIP|tr " " "\n"fi}function main(){CheckInput $*if [ $? -ne 0 ] ; then  echo -e $"USAGE: $0 {ipaddress}\nExample:\n$0 192.168.1.10  will check 192.168.1.10 only\n$0 192.168.1.0 will check 192.168.1.1 - 192.168.1.254 "else  CheckIp $*  if [ $? -ne 0 ] ; then    echo "Please input correct ip address . such as 192.168.1.10 or 192.168.1.0"  else    TMP_ACTIVE=$(mktemp)    TMP_DOWN=$(mktemp)    >/tmp/active.host    >/tmp/down.host    SelectPing $*    SortIp    Show    rm -f /tmp/active.host    rm -f /tmp/down.host  fifi}main $*